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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22252c4459805dcbbc73c8e37efef059445114ef43006bda4a38d59d3c18ba7c' 
  AND token = 'GSHiRagT7wyMjwK31Sgq7zEGau4hz6vhDlMlsaypChE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}